What do you actually find if you pull off at Liberty Canyon Road right now, months before anyone cuts a ribbon? Painted lady butterflies. A resident western fence lizard the construction crew has taken to calling Bob. Red-tailed hawks and American kestrels making regular flybys. None of that is scheduled to happen later. It's already happening, on a bridge that isn't even connected to the ground on either side yet.
That's the part of this story most people miss. The Wallis Annenberg Wildlife Crossing over the 101 at Liberty Canyon now has a hard opening date, December 2, 2026, four and a half years after the Earth Day 2022 groundbreaking. But the wildlife didn't wait for the ribbon cutting. Beth Pratt, the National Wildlife Federation's regional executive director who has championed the project from the start, put it simply when she made the announcement in April: "If you're doing OK for the pollinators, that means you're doing OK for the big stuff." For a project everyone in Southern California has heard described as "the world's largest wildlife crossing," that's a strange and quietly reassuring detail to learn only now: it's been working, in the smallest ways, long before anyone officially opens it for mountain lions.
The gap between 2022 and now
When crews broke ground, the price tag was $87 million and the target finish was 2025. Neither held. Two consecutive rainy springs saturated the site and stopped work outright, and building a living, planted structure over ten lanes of one of the country's busiest freeways turned out to be harder and slower than pouring a standard overpass. Here's the difference between the pitch and where things actually stand:
| At groundbreaking (2022) | As of spring 2026 | |
|---|---|---|
| Projected cost | $87 million | $114 million |
| Projected completion | 2025 | December 2, 2026 |
| Construction status | Not started | About 60% complete |
Robert Rock of Rock Design Associates, who has been tracking construction milestones, put the project at roughly 60 percent done as of this spring. The main span over the freeway looks largely finished and landscaped from above. What's left is the harder-to-see part: a second bridge section over Agoura Road, and the work of physically linking both ends of the structure to the open space on either side so animals can actually walk onto it.
What doesn't change on the 101
If you commute this stretch of the Ventura Freeway, the natural assumption is that a project this size means months of lane closures and rerouted traffic. It doesn't, at least not during the day. Caltrans has been direct about this in its own project FAQ: freeway lanes in both directions stay open through most of the day for the duration of construction, with closures limited mainly to nighttime work and detours provided as needed. Noise near the site is expected to stay at ordinary freeway levels, and Caltrans says it's monitoring for anything that would spill over into nearby neighborhoods.
In other words, the disruption that a project this size implies mostly isn't happening where you'd notice it. The story here isn't traffic. It's what's being built above you while you drive under it.
The trail you already know becomes the front door
If you've hiked the Liberty Canyon area, you already know the terrain the crossing sits on top of. The existing Liberty Canyon Wildlife Crossing trail is a 2.7-mile out-and-back route, generally rated easy, with about 377 feet of elevation gain and a run time of roughly an hour to ninety minutes. Trail reviewers note it's lightly trafficked, with a first quarter mile that isn't well established, heavy brush in spots, and cell service that drops out within about 500 yards of the trailhead. It's the kind of low-key local trail residents use for a workout with a decent chance of spotting wildlife, not a destination hike.
Once the crossing connects to open space on both sides, that trail effectively becomes the on-ramp to the same corridor mountain lions, bobcats, gray foxes, and mule deer will be using to move between the Santa Monica Mountains and the Simi Hills. The trailhead most locals already use for an evening walk is the same ground where decades of GPS-collared mountain lion tracking data, going back to studies that began in the mid-1990s, pointed to this exact spot as the best possible crossing point on the entire 101.
What's still being built, in plain terms
The Stage 1 structure, the actual bridge over the freeway, has been done since June 2025. What's happening now is Stage 2: extending the crossing over Agoura Road and finishing roughly 13 acres of habitat restoration, including native plantings meant to make the whole thing feel like an extension of the hillside rather than a bridge. Project organizers have said the ribbon cutting will fall around the same Urban Wildlife Week programming tied to P-22 Day, the annual celebration named for the Griffith Park mountain lion whose story helped drive public support for this project in the first place. Details on exactly how that plays out locally in December are still coming, but it puts the opening in the same season as another fixture on the Agoura Hills calendar.
Reyes Adobe Days, now in its 22nd year, runs October 2 through 4 this year at the Reyes Adobe Historical Site and Whizin Market Square, with Night at the Adobe kicking off Friday evening and the RAD 5K closing things out Sunday morning, a portion of race proceeds going to the Malibu/Lost Hills Search and Rescue Team. Two months later, the wildlife crossing opens a few miles up the road. It's a fall and early winter that gives residents two very different but very local reasons to pay attention to the calendar.
Why this matters more than the headline number
Every national story about this project leads with the budget overrun or the "world's largest" label, and both are true. But if you live here, the numbers that matter are smaller and more specific: which lanes close and when, whether the trail you already hike changes, and what you're actually going to see if you stop and look. The pollinators and the lizard named Bob got there first. The mountain lions are next. Everyone else finds out on December 2.
If you're weighing what a home near Liberty Canyon, Old Agoura, or anywhere close to this corridor is actually worth, that kind of on-the-ground detail is exactly what a market report or a listing sheet won't tell you. Truth Realty works this market street by street, not just by the comps. Schedule a free consultation and talk through what's actually happening in the neighborhood you're looking at.
